Is that sarcasm? The US has done some awful things, but worse than the Nazis? That is a big accusation.
Tell that to the people of Nagasaki.
I am a Russian history major. I have taken a multitude of college level history classes, and i can assure you that the only argument that could be made regarding the US being equal to the the Nazis would be regarding Native Americans. That being said, its a stretch of an argument to make. Sure there were atrocities committed against the Native Americans, i am in no way attempting to downplay the impact of settlers in the "new world". However, a majority of Natives fell to disease as opposed to death camps, or as a result of expansion of the previously mentioned settlers. Some settlers did gain the mindset that all of the Natives needed to be killed (this is not uncommon in war, many natives gained this mindset) but it was never the official government policy. For the most part the US did a horrible job of relocating these people to the worst lands in the US. But it was never a government policy to set up death camps.
Then we must also take into account that much of this was not US policy but British policy, and it was from about 200-300 years ago. We must accept those faults, but one must certainly also realize that the standard for which we judge these acts is a 200-300 year old standard. Had the US or British committed these atrocities during the 20th century they would be judged accordingly.
The US has done TONS of other horrible things, but no single act can equate to setting up death camps for the Jewish population strictly because Hitler needed a scapegoat for the failure of the German population. When the US does something horrible its usually because it has something to gain, not because it wants to see something burn.
My final thought is that this is not the word of god. Everyone is entitled to their own opinion, i just happen to know where the middle ground/majority view is among historians. If your family was killed or you had a relative die of radiation in japan due to the use of nuclear bombs, you may have a much more extreme view of the US government. If the majority of you people died on the trail of tears, you may feel that your people have suffered as much as the Jews in Europe did in the 1930s and 1940s. And these people would have valid and completely reasonable opinions. because for them it does not matter how or why such an atrocity could happen, but simply that it did happen, and that it is inexcusable.
In the end though, these are not the majority view. There are as many Japanese who feel that their leaders bringing of war to the US was the cause of their sorrow as there are who blame the US, and both have valid and respectable opinions.
So you may claim that the US has committed atrocities equal or worse than the Nazis, it is just that this is not the majority view, it is an extremest position.
Sorry for the boring essay guys, again, i'm a history major so its just in my nature to see a history related comment and go, "well how is he going to back that one up"?